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POHow to Clear Triggered Control Template
 

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    <p>I am trying to achieve the "hint text" functionality for a TextBox in WPF. I can set the default text fine, but the problem comes when I want the control to return its appearance to a normal TextBox. Here is the trigger I have so far:</p> <p><strong>Trigger A</strong></p> <pre><code>&lt;Trigger Property="Text" Value="{x:Static sys:String.Empty}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="TextBox"&gt; &lt;TextBox&gt; &lt;TextBox.Background&gt; &lt;VisualBrush AlignmentX="Left" AlignmentY="Center" Stretch="UniformToFill"&gt; &lt;VisualBrush.Visual&gt; &lt;Label Content="{TemplateBinding TextBox.Tag}" Background="White"/&gt; &lt;/VisualBrush.Visual&gt; &lt;/VisualBrush&gt; &lt;/TextBox.Background&gt; &lt;/TextBox&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Trigger&gt; </code></pre> <p>This sets the <code>Background</code> to a <code>VisualBrush</code> when the <code>Text</code> property is empty. What I need to do is clear this <code>ControlTemplate</code> when the user selects the <code>TextBox</code> to input text.</p> <p>Here is what I tried:</p> <p><strong>Trigger B</strong></p> <pre><code>&lt;Trigger Property="IsKeyboardFocused" Value="True"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="TextBox"&gt; &lt;TextBox/&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Trigger&gt; </code></pre> <p>These two don't work together. I tested each by changing the <code>Background</code> colors. If I comment out either one, they will each work. If both are uncommented, Trigger A works and B is never seen. How can I remove/overwrite Trigger A?</p> <p>I know that the functionality of these templates is supposed to clear when the trigger condition is no longer met, but for example, Trigger A's setting will not go away when I enter text into the <code>TextBox</code> like it should. Like the Text property is still <code>String.Empty</code> or something.</p> <p>So what am I missing?</p> <p><strong>EDIT:</strong></p> <p>Here is the whole style (there's not much more to it):</p> <pre><code>&lt;UserControl.Resources&gt; &lt;Style TargetType="TextBox" x:Key="FormsTextBox"&gt; &lt;Setter Property="Width" Value="45"/&gt; &lt;Setter Property="Margin" Value="3 2 3 2"/&gt; &lt;Style.Triggers&gt; &lt;Trigger Property="Text" Value="{x:Static sys:String.Empty}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="TextBox"&gt; &lt;TextBox&gt; &lt;TextBox.Background&gt; &lt;VisualBrush AlignmentX="Left" AlignmentY="Center" Stretch="UniformToFill"&gt; &lt;VisualBrush.Visual&gt; &lt;Label Content="{TemplateBinding TextBox.Tag}" Background="White" Width="45"/&gt; &lt;/VisualBrush.Visual&gt; &lt;/VisualBrush&gt; &lt;/TextBox.Background&gt; &lt;/TextBox&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Trigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; </code></pre>
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